Cal. Bus. & Prof. Code § 4826

A person practices veterinary medicine, surgery, and dentistry, and the various branches thereof, when he or she does any one of the following:

(a) Represents himself or herself as engaged in the practice of veterinary medicine, veterinary surgery, or veterinary dentistry in any of its branches.

(b) Diagnoses or prescribes a drug, medicine, appliance, application, or treatment of whatever nature for the prevention, cure or relief of a wound, fracture, bodily injury, or disease of animals.

(c) Administers a drug, medicine, appliance, application, or treatment of whatever nature for the prevention, cure, or relief of a wound, fracture, bodily injury, or disease of animals, except where the medicine, appliance, application, or treatment is administered by a registered veterinary technician or an unregistered assistant at the direction of and under the direct supervision of a licensed veterinarian subject to Article 2.5 (commencing with Section 4832) or where the drug, including, but not limited to, a drug that is a controlled substance, is administered by a registered veterinary technician or an unregistered assistant pursuant to Section 4836.1. However, no person, other than a licensed veterinarian, may induce anesthesia unless authorized by regulation of the board.

(e) Performs any manual procedure for the diagnosis of pregnancy, sterility, or infertility upon livestock or Equidae.

(f) Uses any words, letters or titles in such connection or under such circumstances as to induce the belief that the person using them is engaged in the practice of veterinary medicine, veterinary surgery, or veterinary dentistry. This use shall be prima facie evidence of the intention to represent himself or herself as engaged in the practice of veterinary medicine, veterinary surgery, or veterinary dentistry.